/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina.mbeans;

import org.apache.catalina.deploy.ContextResourceLink;
import org.apache.catalina.deploy.NamingResources;
import org.apache.tomcat.util.modeler.BaseModelMBean;

import javax.management.*;
import javax.management.modelmbean.InvalidTargetObjectTypeException;

/**
 * <p>A <strong>ModelMBean</strong> implementation for the
 * <code>org.apache.catalina.deploy.ContextResourceLink</code> component.</p>
 *
 * @author Amy Roh
 */
public class ContextResourceLinkMBean extends BaseModelMBean {


	// ----------------------------------------------------------- Constructors

	/**
	 * Construct a <code>ModelMBean</code> with default
	 * <code>ModelMBeanInfo</code> information.
	 *
	 * @throws MBeanException             if the initializer of an object
	 *                                    throws an exception
	 * @throws RuntimeOperationsException if an IllegalArgumentException
	 *                                    occurs
	 */
	public ContextResourceLinkMBean()
			throws MBeanException, RuntimeOperationsException {

		super();

	}


	// ----------------------------------------------------- Instance Variables


	// ------------------------------------------------------------- Attributes

	/**
	 * Obtain and return the value of a specific attribute of this MBean.
	 *
	 * @param name Name of the requested attribute
	 * @throws AttributeNotFoundException if this attribute is not
	 *                                    supported by this MBean
	 * @throws MBeanException             if the initializer of an object
	 *                                    throws an exception
	 * @throws ReflectionException        if a Java reflection exception
	 *                                    occurs when invoking the getter
	 */
	@Override
	public Object getAttribute(String name)
			throws AttributeNotFoundException, MBeanException,
			ReflectionException {

		// Validate the input parameters
		if (name == null)
			throw new RuntimeOperationsException
					(new IllegalArgumentException("Attribute name is null"),
							"Attribute name is null");

		ContextResourceLink cl = null;
		try {
			cl = (ContextResourceLink) getManagedResource();
		} catch (InstanceNotFoundException e) {
			throw new MBeanException(e);
		} catch (InvalidTargetObjectTypeException e) {
			throw new MBeanException(e);
		}

		String value = null;
		if ("global".equals(name)) {
			return (cl.getGlobal());
		} else if ("description".equals(name)) {
			return (cl.getDescription());
		} else if ("name".equals(name)) {
			return (cl.getName());
		} else if ("type".equals(name)) {
			return (cl.getType());
		} else {
			value = (String) cl.getProperty(name);
			if (value == null) {
				throw new AttributeNotFoundException
						("Cannot find attribute " + name);
			}
		}

		return value;

	}

	/**
	 * Set the value of a specific attribute of this MBean.
	 *
	 * @param attribute The identification of the attribute to be set
	 *                  and the new value
	 * @throws AttributeNotFoundException if this attribute is not
	 *                                    supported by this MBean
	 * @throws MBeanException             if the initializer of an object
	 *                                    throws an exception
	 * @throws ReflectionException        if a Java reflection exception
	 *                                    occurs when invoking the getter
	 */
	@Override
	public void setAttribute(Attribute attribute)
			throws AttributeNotFoundException, MBeanException,
			ReflectionException {

		// Validate the input parameters
		if (attribute == null)
			throw new RuntimeOperationsException
					(new IllegalArgumentException("Attribute is null"),
							"Attribute is null");

		String name = attribute.getName();
		Object value = attribute.getValue();
		if (name == null)
			throw new RuntimeOperationsException
					(new IllegalArgumentException("Attribute name is null"),
							"Attribute name is null");

		ContextResourceLink crl = null;
		try {
			crl = (ContextResourceLink) getManagedResource();
		} catch (InstanceNotFoundException e) {
			throw new MBeanException(e);
		} catch (InvalidTargetObjectTypeException e) {
			throw new MBeanException(e);
		}

		if ("global".equals(name)) {
			crl.setGlobal((String) value);
		} else if ("description".equals(name)) {
			crl.setDescription((String) value);
		} else if ("name".equals(name)) {
			crl.setName((String) value);
		} else if ("type".equals(name)) {
			crl.setType((String) value);
		} else {
			crl.setProperty(name, "" + value);
		}

		// cannot use side-effects.  It's removed and added back each time
		// there is a modification in a resource.
		NamingResources nr = crl.getNamingResources();
		nr.removeResourceLink(crl.getName());
		nr.addResourceLink(crl);
	}

}
